Discharge valve for compressors



sep1.14 1926. 1,599,716

J. R. REPLOGLE DISCHARGE VALVE FOR GOMPRESSORS Filed Oct. 10', 1921 @nbc/nto@ Parenteel Sept.- 14, 1926.

UNITED STATE/s PATENT OFFICE.

JOHN R. REPLOGLE, O F DETROIT, MICHIGAN, lASSIGNOR, BY MESNE ASSIGNMENTS, T0 N IZEB CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF) MARYLAND.

DISCHARGE 'VALVE FOR COMPBESSOB'S.

Application led October 10, 1921. Serial No. 506,808.

My invention relates to gas compressing pumps designed for use in mechanical refrigerating systems to compress and liquefy the vaporized ammonia, sulphur dioxide, or equivalent highly volatile refrigerating medlum employed in the system.- Such a system is disclosed in and various features thereof form the sub'ect matter of my application for Letters atent filed upon June 6, 1921, Serial Number 475,344 fora re.

friger-ating unit; and my invention as here-- in disclosed relatesparticularly Ato the discharge or outlet valve mechanism or device of the pump or compressor of such systems. The principal object of my invention is to provide discharge valve mechanism of the I type above referred to 'wherein an improved guide, and improved means for lubricating the bea-ring between the valve and the guide, are provided.

A further object of my invention is to provide an" improved form of outlet or-dis.

charge valve for compressors of the class referred to which may be more readily and cheaply manufactured, and which will be lighter and otherwise more satisfactory than has commonly been the case in valves of the type to which my invention relates.

lVith the above and other objects of invention in view my invention consists in theirnproved valve device for gas compressors illustrated in the accompanying drawing'and hereinafter described and claimed; and in such variations and modifications thereof, within the scope of the concluding claims, as will be obvious to those skilled in the art to which my invention relates.

In the drawing accompanying and forining a part of this s ecification and wherein the preferred embodiment of my invention is illustrated Figure 1 is a view showing a compressor cylinder with its valves and various other elements `associated therewith, in section upon a substantially central plane extending along the axis of the cylinder.

Figure 2 is a view upon a larger scale showing the cylinder head and the discharge valve of the compressor in plan.

Figure 3 is a section on the line 3-3, Figure 2. p

Figure 4 is a vertical section of a modified form of the device, with parts broken away.

Referring now to the drawing, the reference numeral 5 designates the cylinder of a pump or compressor designed forvuse in a. refrigerating system of the compression typen/to compress the vaporized refrigerating medium as a step incident to the hquication thereof; said cylinder being supported upon the upper end ofl a crank case 6 into which vaporized refrigerating medium is discharged, and from which it passes through the valved piston 7 upon the down stroke thereof, and into the cylinder above the piston. Upon the up stroke of the piston the vapor or gas 1s compressed and forced past the discharge valve 8 and into a condensingchamber rovided by the dome 9; and wherein a coo ing coil', not shown, is located whereby the compressed gas or vapor is cooled to an extent sufficient tocause it to return to a liquid form.

The valve 8 1s cylindrical in cross section and open at its upper and vclosed at its lower end, thereby providing a. valve which may be properly designatedashollow and cup-shaped; and the lower end thereof is so shaped as to provide an annular inclined seating surface at 16, as best shown in Figure 3 of the drawing. This valve is preferably made from a. circular sheet metal blank by subjecting it to suitable drawing and shaping processes whereby a thin -walled valve and one of light weight is produced; and .which valve, being made from metal which is necessarily tough and ductile and of uniform molecular structure throughout, will not be likely to become broken when the same is in use.

The discharge valve above referred to is guided initsmovement by an annular guide 10 shown asformed integrally with the cylinder head of the compressor, and as. having a central cylindrical opening in which said valve moves with a close sliding lit; the valve being held in place by a cross bar 11 `fastened to the upper end of said guide. The

valve in question is returned to itsclosed 100 position by a spring 12 located inside the same and acting between its closed lower end and a boss or abutment 13 secured to the under side of the cross bar 11.

,The annular guide 10 is provided with a 1015'4 suiiicient number of passages 14 the lower ends of Awhich communicate with an internal annular groove or recess 15 located above the valve seat at 16, and through which the gas or vapor whichis discharged from the 11 pump cylinder passes upward and into the interior of the dome 9; and the cylindrical side wall of the valve 8 is provided with one or more holes 17 which communicate with the groove 15 when the valve is in its lowermost position, and put the interior of the valve in communication with thek said groove at that time.

In refrigeratingv systems of the class to which this present invention relates and of the class dlsclosed in my application for patent hereinbefore identified a considerable quantity of oil for lubricating purposes, as well also as for accomplishing the sealing of the valves of the compressor and other valves, is mixed with the vaporized refrigerating medium and finds its way back into the crank case.

In my invention as herein disclosed oil will accumulate in the internal annular re-. cess 15, and in the outlet passages 14, to an extent Jsullicient to seal the valve and prevent backilow of the gas operated upon, and a part of the oil here contemplated will run through the holes 17 and into the interior of the valve. It therefore .follows that u on each upward movement of the valve, t e holes being submerged in the normal operation thereof, oil will be carried up and into contact with the inner. wall of the guide 10 within which the valve operates; thus keeping the bearing between the valve and the guide properly lubricated when the compressor is in operation.

In the form of the device shown in Fig. 4, the valve 8 is substantially the same as that shown in Figures 1 to 3, but the means for holding the same in lowered position is diierent. In this form of the device, mechanism is provided which-co-operates with the valve to produce a dash-pot eiect to retard the movement of said valve in order to prevent chattering, or undue.- vibration of the same. Any suitable mechanism for performing this function may be employed. As shown, a plunger or piston 1'8 having a stem 19 is used. The plunger or piston 18 is held rigidly in position 'by any suitable means, as the screw 20 which extends.

through the cross-piece 11-y and. engages a tapped hole in the end of the stem 19. .A spring 21 between the lower face of they piston 18 and 'the bottom of the cup-Shaped valve 8 tends to hold .the valve 8 in lowered position on its seat. The plunger or piston 18 is 'of slightly less diameter than the interiorof the cup-shaped valve 8 and as aresult apart of the oil that accumulates in the same will be forced past thel iston when the valve is elevated and wil lflow back when the valve is lowered, thus 4-further damping the movements of the said valve and thereby preventing chattering or undue vibration'of the same.

Having thus described and invention, I claim anddesire Letters Patent z l. In apparatus of the class described, the combination of an annular valve seat, a valve guide above said seat, a valve adapted to rest upon saidseat and having a guide extension arranged to slidably engage said guide and a liquid seal chamber surrounding the valve above the valve seat, the guideengaglng surface of the valve being formed with an opening adapted to communicate with the said chamber when the valve is closed and to moveover the guide surface when the valve is opened, whereby liquid lubricant in said chamber is lifted and delfivered by said opening to said guide surace.

2. In apparatus of the class described, the combination of an annular valve seat, a valve guide above said seat, an upwardly opening cup-shaped valve having cylindrical side walls to engage said guide and formed at its closed lower end with an annular surface to engage said seat, a liquid seal chamber surrounding the valve above the seat, the guide-engaging surface of the valve side wall being formed with openings therethrough adapted to communicate with the said chamber when the valve is closed and to move over the said surface when the valve is opened, whereby liquid in said chamber is lifted and delivered by said explained my to secure by openings to said guide surface and liquidis conveyed. through said openings into the valve cavity, and a relatively stationary piston device in the valve adapted in cooperation with liquid therein to retard the movement of the valve.

3. In apparatus of the class described,

the combination of an integral .structurer adapted to communicate with .said chamber.

when the valve is closed and tolmove over the lguide surface when the valve is opened, whereby the liquid lubricant in said chamber is lifted and delivered by saidopenin'gto said guide surface.

In testimony whereof I aix my signature.

" JOHN R. REPLOGLE. 

